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Objective To compare the bactericidal effects of high pressure (HP), slightly acidic electrolyzed water (SAEW) their combination (HP-SAEW) and thermd treatment (T), slightly acidic electrolyzed water combination treatment (T-SAEW) on Escherichia coli at the surface of Panax notoginseng fresh slices. Methods The E. coli was being used as the model bacteria and the standard plate counting method was adopted to determine the colony count of E. coli. The bactericidal effects of the two parallel treatment methods (HP-SAEW and T-SAEW) on Panax notoginseng fresh slices under different factors (solid-liquid ratio, processing times, available chlorine concentration (ACC), pressure and temperature) were studied and the synergistic effect analysis were further measured. Results The HP-SAEW parallel processing exhibited synergistic effect on the Panax notoginseng fresh sliced within a certain range of ACC (27.6-52.2 mg/L), pressure (98.5-297.5 MPa), solid-liquid ratio (1.76-5.88 g/mL), and processing time (5.56-9.48 min). The bactericidal effect of the HP-SAEW parallel treatment was better than that treated alone (SAEW or HP). The T-SAEW parallel processing exhibited synergistic effect on the Panax notoginseng fresh sliced within a certain range of ACC (25.44-46.88 mg/L), temperature (39.78-53.85 ℃), solid-liquid ratio (2.27-4.42 g/mL), and processing time (5.02-9.84 min). The bactericidal effect of the T-SAEW parallel treatment was better than that treated alone (SAEW or T). Conclusion The parallel combined effect has synergistic enhancement effect in the specific processing parameter range, T-SAEW parallel technology can more effectively inhibit the growth of surface microorganisms in fresh slices. On this basis, the quality change in the storage process of fresh Panax notoginseng can be carried out and applied in the actual production process in the future work.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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